6. Considerations for the choice of construction methods
6.1 Selection criteria
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Numerous criteria will guide the choice of construction method for an underground structure.
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Length of structure
This is a major criterion when it comes to choosing a mechanized method (TBM): the supply of a TBM is a significant investment, and only a sufficiently long tunnel length can make this investment profitable.
A minimum tunnel length of the order of one kilometer can be assumed to justify the use of a TBM, with exceptions of course (e.g. unfeasibility of building the structure using conventional methods, availability of a machine suited to the geometric and geotechnical context of the structure).
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Considerations for the choice of construction methods
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